Or maybe, since you want to be an arse, we thought that you might be intelligent enough to grasp what are simple concepts, without additional support.
However, since you are too lazy to look for info yourself:
So, in summary: if you let all ships creep in power over time, then all missions, anomalies, structures, etc. become easier and easier to complete or destroy.
As things become easier, challenge drops and the game becomes boring.
So to counter that, all those things need to be increased in power as well.
However that would have the effect of making it far more difficult for new players to get into the game, because they would struggle in their relatively weak ships, against the stronger rats, the more difficult missions and smaller groups would struggle to destroy assets the same way they can currently.
Then, at some point, it would be too challenging and again not enjoyable.
In addition, even where the devs try to maintain the balance by continuously rebalancing the existing PvE content, that creates additional dev workload, just to keep existing content interesting. That eats into the time available to develop new content and the game stagnates slightly. Easier to keep creep in check, so that existing content doesn’t need continual rebalancing, then new content expands the options for players.
Power creep significantly affects balance and ruins the experience for everyone because it’s not just one ship being made stronger, everything needs to be made stronger and more difficult to counter the power creep.